BL Touch does self test and then ignores all further commands



  • Like the title says, my BL touch when the printer is turned on does its self test but then ignores all the commands I try to send to it after that. Anyone have any ideas?



  • Is this a new BLTouch? Did it work previously? What commands are you sending to control it? How is it connected? Can you post your config and deployment macros?





  • @phaedrux

    It is a BL touch I have been using, it was working just fine before this issue started.

    I am using the deployment macros and test macros I am posting below

    here is the config file
    ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M667 S1 ; Select CoreXY mode

    ; Network
    M550 P"Hypercube 25" V1" ; Set machine name
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Drives
    M569 P1 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards
    M569 P5 S1 ; Drive 5 goes forwards
    M569 P6 S1 ; Drive 6 goes forwards
    M569 P7 S1 ; Drive 7 goes forwards
    M569 P8 S1 ; Drive 8 goes forwards
    M569 P9 S1 ; Drive 9 goes forwards
    M584 X0 Y1 Z6:7:5:2 ; Z Motor Mapping
    M671 X-22.75:670.0:-22.75:670.0 Y500.0:500.0:127.0:127.0 S5. P8.0
    M350 X16 Y16 Z16 E16:16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z800.00 E145.45:420.00 ; Set steps per mm
    M566 X500.00 Y500.00 Z12.00 E120.00:120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z400.00 E1200.00:1200.00 ; Set maximum speeds (mm/min)
    M201 X900.00 Y900.00 Z20.00 E250.00:250.00 ; Set accelerations (mm/s^2)
    M906 X800.00 Y800.00 Z800.00 E800.00:800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X625 Y610 Z625 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S1 ; Set active high endstops

    ; Z-Probe
    M574 Z1 S2 ; Set endstops controlled by probe
    M307 H7 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
    M558 P9 H5 F600 T8000 X0 Y0 Z1 ; Set Z probe type/mode 9. H=Dive Height. F=Speed the bed moves
    G31 P25 X-27.0 Y0.0 Z1.7772 ; Set Z probe trigger value, offset and trigger height
    M557 X30:550 Y30:550 S25 ; Define mesh grid

    ; Heaters
    M141 H5 ; Assign chamber heater to heater 0
    M307 H6 B0 S1.0 ; Enable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C
    M305 P2 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 2
    M143 H2 S280 ; Set temperature limit for heater 2 to 280C
    M305 P5 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 6
    M143 H5 S120 ; Set temperature limit for heater 6 to 120C

    ; Fans
    M106 P0 S0 I0 F500 H-1 C"Parts Cooler Fan0" ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45 C"Hotend Fan Fan1" ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P3 S255 I0 F500 H-1 C"LED Strip Fan3" ; Set fan 3 value, PWM signal inversion and frequency. Thermostatic control is turned off

    ; Tools
    M563 P0 D0 H1 ; Define tool 0
    G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
    M563 P1 D1 H2 ; Define tool 1
    G10 P1 X25.784 Y0 Z0 ; Set tool 1 axis offsets
    G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

    ; Automatic saving after power loss is not enabled

    ; Custom settings are not configured

    ; Miscellaneous

    MACROS

    M280 P7 S160 ; Alarm Release and Push-Pin UP

    M280 P7 S10 ; Send PWM channel 7 the s10 (angle) command

    M280 P7 S90 ; Send PWM channel 7 the S90 (angle) command

    M280 P7 S120 ; Send PWM channel 7 the S10 (angle) command

    It was working fine and then I went to run a g32 and it didnt deploy the pin so I had to emergency stop it and it has not responded to commands since. I have power cycled it as well and same thing, but it does the self test and appears normal but is entirely unresponsive



  • Are you using a Duex? How is it wired? Usually the servo commands require the I1 flag to invert the signal when connected directly to the Duet, but not when connected to the Duex.

    After the self test at boot up, is the LED lit? Is it flashing?

    What happens if you physically pull out the pin, can you retract it then?

    Did the pin make contact with the bed before you could emergency stop? Possible damage to the pin?

    If you disassemble the probe by removing the set screw in the top of the probe you can take the pinout and check it for damage or debris.



  • @phaedrux I am using a duex5, it is connected with the ribbon cable and running 3 of the Z motors.

    When I do the boot up and it self tests it does not flash it stays with the LED on like everything is normal

    If I pull out the pin it moves smoothly and the light turns off like it is operating correctly, when I put the pin back the light turns back on

    the pin never deployed so damage to the pin seems unlikely through that route

    I will disassemble it now and see what I can glean



  • This is strange.

    I just bought a bltouch version 2.2 (jan 2019) still have trouble and issues. But mine reacts only with I1 instead of I-1!! And i have only a duet wifi no duex attached.

    I will post a separate help cry 😢



  • @phaedrux I see no obvious damage on the pin or anywhere else for that matter.

    I also ran a test to run the probing routine but pull the pin out manually beforehand it it did not work that way either


  • administrators

    @deanethiro said in BL Touch does self test and then ignores all further commands:

    @phaedrux I am using a duex5, it is connected with the ribbon cable and running 3 of the Z motors.

    When I do the boot up and it self tests it does not flash it stays with the LED on like everything is normal

    If I pull out the pin it moves smoothly and the light turns off like it is operating correctly, when I put the pin back the light turns back on

    the pin never deployed so damage to the pin seems unlikely through that route

    I will disassemble it now and see what I can glean

    1. Check the crimp connection of the servo control wire (orange wire) to the connector that plugs into the DueX5.

    2. Try sending the M280 P7 S10 and M280 P7 S90 commands manually to see if the pin will deploy and retract, and check for error messages.

    3. Try connecting it to another heater/servo output, e.g. PWM_4/heater 6 instead of PWM_5/heater 7 (and use P6 instead of P7 in the M280 commands).



  • @dc42 you saved the day again! It was a lose wire crimp that must have come undone over time!


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